Role of enhanced receptor engagement in the evolution of a pandemic acute hemorrhagic conjunctivitis virus.Baggen, J., Hurdiss, D.L., Zocher, G., Mistry, N., Roberts, R.W., Slager, J.J., Guo, H., van Vliet, A.L.W., Wahedi, M., Benschop, K., Duizer, E., de Haan, C.A.M., de Vries, E., Casasnovas, J.M., de Groot, R.J., Arnberg, N., Stehle, T., Ranson, N.A., Thibaut, H.J., van Kuppeveld, F.J.M.
(2018) Proc. Natl. Acad. Sci. U.S.A. 115: 397-402
- PubMed: 29284752
- DOI: 10.1073/pnas.1713284115
- PubMed Abstract:
Acute hemorrhagic conjunctivitis (AHC) is a painful, contagious eye disease, with millions of cases in the last decades. Coxsackievirus A24 (CV-A24) was not originally associated with human disease, but in 1970 a pathogenic "variant" (CV-A24v) emerge ...
Acute hemorrhagic conjunctivitis (AHC) is a painful, contagious eye disease, with millions of cases in the last decades. Coxsackievirus A24 (CV-A24) was not originally associated with human disease, but in 1970 a pathogenic "variant" (CV-A24v) emerged, which is now the main cause of AHC. Initially, this variant circulated only in Southeast Asia, but it later spread worldwide, accounting for numerous AHC outbreaks and two pandemics. While both CV-A24 variant and nonvariant strains still circulate in humans, only variant strains cause AHC for reasons that are yet unknown. Since receptors are important determinants of viral tropism, we set out to map the CV-A24 receptor repertoire and establish whether changes in receptor preference have led to the increased pathogenicity and rapid spread of CV-A24v. Here, we identify ICAM-1 as an essential receptor for both AHC-causing and non-AHC strains. We provide a high-resolution cryo-EM structure of a virus-ICAM-1 complex, which revealed critical ICAM-1-binding residues. These data could help identify a possible conserved mode of receptor engagement among ICAM-1-binding enteroviruses and rhinoviruses. Moreover, we identify a single capsid substitution that has been adopted by all pandemic CV-A24v strains and we reveal that this adaptation enhances the capacity of CV-A24v to bind sialic acid. Our data elucidate the CV-A24v receptor repertoire and point to a role of enhanced receptor engagement in the adaptation to the eye, possibly enabling pandemic spread.
Division of Virology, Department of Clinical Microbiology, Umeå University, 90187 Umeå, Sweden.,Astbury Centre for Structural Molecular Biology, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom.,Department of Macromolecular Structures, Centro Nacional de Biotecnología, Campus Universidad Autónoma de Madrid, 28049 Madrid, Spain.,Centre for Infectious Disease Control, National Institute for Public Health and the Environment, 3720BA Bilthoven, The Netherlands.,Virology Division, Department of Infectious Diseases and Immunology, Faculty of Veterinary Medicine, Utrecht University, 3584CL Utrecht, The Netherlands.,Virology Division, Department of Infectious Diseases and Immunology, Faculty of Veterinary Medicine, Utrecht University, 3584CL Utrecht, The Netherlands; F.J.M.vanKuppeveld@uu.nl.,Interfaculty Institute of Biochemistry, University of Tübingen, 72076 Tübingen, Germany.